Abstract
The activity of Eucalyptus essential oil against eleven strains pertaining to six species of plant pathogenic bacteria was studied using growth inhibition and contact assays. All strains were susceptible to the formulation EGL2, and Xylella fastidiosa subspecies and Xanthomonas fragariae were the most sensitive. The bactericidal effect was strong causing 4.5 to 6.0 log reductions in survival in 30 min at concentrations in the range of 0.75 to 15.0 μl/ml depending on the bacteria tested. Transmission electron microscopy of the formulation EGL2 against the three X. fastidiosa subspecies studied allowed the observation of a strong lytic effect on bacterial cells. In addition, the preventive spray application of EGL2 to potted pear plants subsequently inoculated with Erwinia amylovora significantly decreased the severity of infections. Almond plants treated by endotherapy or soil drenching, and then inoculated with X. fastidiosa showed a significant decrease in disease severity as well as in the levels of the pathogen, depending on the strategy used (endotherapy/soil drenching, preventive/curative). The treatment by endotherapy in almond plants induced the expression of several genes involved in plant defense. It was concluded that the reduction of infections by the Eucalyptus oil treatments was due to the combination of its bactericidal and plant defense induction activities.
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Claims 9
Claim · model-written summary
EGL2 inhibited all tested bacterial strains.
- Taxon
- almond plants
Prunus dulcist0 - Treatment
- formulation EGL2e0
- Interactor
- plant pathogenic bacteriae0pathogen
- Outcome
- All strains were susceptiblee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant pathogenic bacteria was studied using growth inhibition and contact assays. All strains were susceptible to the formulation EGL2”
t0“almond plants”
Claim · model-written summary
Xylella fastidiosa subspecies and Xanthomonas fragariae were the most sensitive bacteria.
- Taxon
- almond plantsPrunus dulcist0
- Interactor
- Xylella fastidiosa subspecies
Xylella fastidiosae0pathogen - Second interactor
- Xanthomonas fragariaeXanthomonas fragariaee0pathogen
- Outcome
- most sensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Xylella fastidiosa subspecies and Xanthomonas fragariae were the most sensitive”
t0“almond plants”
Claim · model-written summary
EGL2 caused 4.5 to 6.0 log reductions in bacterial survival within 30 minutes.
- Taxon
- almond plantsPrunus dulcist0
- Treatment
- 0.75 to 15.0 μl/mle0
- Outcome
- survivale0
- Direction
- reductionse0
- Value
- 4.5 to 6.0 loge0
- Qualifier
- 30 mine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bactericidal effect was strong causing 4.5 to 6.0 log reductions in survival in 30 min at concentrations in the range of 0.75 to 15.0 μl/ml depending on the bacteria tested”
t0“almond plants”
Claim · model-written summary
EGL2 produced a strong lytic effect on X. fastidiosa cells.
- Taxon
- almond plantsPrunus dulcist0
- Treatment
- formulation EGL2e0
- Interactor
- X. fastidiosaXylella fastidiosae0pathogen
- Outcome
- strong lytic effect on bacterial cellse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“formulation EGL2 against the three X. fastidiosa subspecies studied allowed the observation of a strong lytic effect on bacterial cells”
t0“almond plants”
Claim · model-written summary
Preventive EGL2 spray significantly decreased Erwinia amylovora infection severity in potted pear plants.
- Taxon
- pear plants
_Poirier_Fleurs_et_feuilles.jpg?width=60)
Pyrus communise0 - Treatment
- preventive spray application of EGL2e0
- Interactor
- Erwinia amylovora
Erwinia amylovorae0pathogen - Outcome
- severity of infectionse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Poirier_Fleurs_et_feuilles.jpg?width=500)
Verbatim
e0“preventive spray application of EGL2 to potted pear plants subsequently inoculated with Erwinia amylovora significantly decreased the severity of infections”
Claim · model-written summary
Endotherapy or soil drenching with EGL2 significantly decreased disease severity in almond plants inoculated with X. fastidiosa.
- Taxon
- Almond plantsPrunus dulcise0
- Treatment
- endotherapy or soil drenchinge0
- Interactor
- X. fastidiosaXylella fastidiosae0pathogen
- Outcome
- disease severitye0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Almond plants treated by endotherapy or soil drenching, and then inoculated with X. fastidiosa showed a significant decrease in disease severity”
Claim · model-written summary
Endotherapy or soil drenching with EGL2 significantly decreased pathogen levels in almond plants.
- Taxon
- Almond plantsPrunus dulcise0
- Treatment
- endotherapy or soil drenchinge0
- Interactor
- X. fastidiosaXylella fastidiosae0pathogen
- Outcome
- levels of the pathogene0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Almond plants treated by endotherapy or soil drenching, and then inoculated with X. fastidiosa showed a significant decrease in disease severity as well as in the levels of the pathogen”
Claim · model-written summary
Endotherapy induced expression of several plant defense genes in almond.
- Taxon
- almond plantsPrunus dulcise0
- Treatment
- endotherapye0
- Outcome
- expression of several genes involved in plant defensee0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment by endotherapy in almond plants induced the expression of several genes involved in plant defense”
Claim · model-written summary
The authors attributed reduced infection to bactericidal and plant defense induction activities of Eucalyptus oil.
- Taxon
- almond plantsPrunus dulcist0
- Treatment
- Eucalyptus oil treatmentse0
- Outcome
- reduction of infectionse0
- Qualifier
- bactericidal and plant defense induction activitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction of infections by the Eucalyptus oil treatments was due to the combination of its bactericidal and plant defense induction activities”
t0“almond plants”
The same questions in other papers
application · Xylella fastidiosa · Prunus dulcis (almond)Results agree
1 paper in the same direction as this paper
- positive
application · Erwinia amylovora · Pyrus communis (pear)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.